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As natural food supply for the birds decreases, many species will become rare. Birds are very busy during spring. First they must find a partner, then a living space, lay eggs and raise their young. During summer they moult and get a new coat. In the fall they prepare for winter and during winter they need more fat to keep themselves at the right temperature. Birds can lose 10% of their body weight during a cold night.
Black sunflower seeds contain a high percentage of oil and offer the birds a calorie rich feed full of energy. They can be fed to birds all throughout the year.